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| Donagemma,Guilherme Kangussu; Freitas,Pedro Luiz de; Balieiro,Fabiano de Carvalho; Fontana,Ademir; Spera,Silvio Túlio; Lumbreras,José Francisco; Viana,João Herbert Moreira; Araújo Filho,José Coelho de; Santos,Flávia Cristina dos; Albuquerque,Manoel Ricardo de; Macedo,Manuel Cláudio Motta; Teixeira,Paulo Cesar; Amaral,André Julio; Bortolon,Elisandra; Bortolon,Leandro. |
| Abstract Light soils occupy 8% of the Brazilian territory and are especially expressive in the new and last agricultural frontier in Brazil: the Matopiba region - in the states of Maranhão, Tocantins, Piauí, and Bahia -, where they represent 20% of the area. These soils fit into the textural classes of sand and loamy sand or sandy loam, down to 0.75-m soil depth or deeper, and they are mainly represented by Neossolos Quartzarênicos (Quartzipsamments) and, partly, by Latossolos (Oxisols) and Argissolos (Ultisols). The understanding of soil functioning depends on the establishment of distinguishing criteria for: organic matter dynamics; content and mineralogy of the clay fraction; coarse sand and total sand contents, in relation to those of fine sand; mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural aptitude; Fragile soils; Management and conservation; Neossolos Quartzarênicos (Quartzipsamments); Sandy soils; Soil fertility management. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901003 |
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| Sauer, Johannes; Tchale, Hardwick. |
| In this paper, we analyze the factors that influence the productivity of maize among smallholder farmers, given that unfavourable output and input market conditions throughout the 1990s have compelled smallholder farmers into unsustainable agricultural intensification. We use farm-household survey data in order to compare the productivity of smallholder maize production under integrated (ISFM) and chemical-based soil fertility management using a normalized translog yield response model. The results indicate higher maize yield responses for integrated soil fertility management options after controlling for the intensity of fertilizer application, labour intensity, seed rate, land husbandry practices as well as selected policy factors. The estimated model is... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Malawi; Smallholder agriculture; Soil fertility management; Yield response model; Livestock Production/Industries. |
| Ano: 2006 |
URL: http://purl.umn.edu/21423 |
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| Sauer, Johannes; Tchale, Hardwick. |
| In this paper, we analyze the factors that influence t he productivity of maize among smallholder farmers, given that unfavourable output and input market conditions throughout the 1990s have compelled smallholder farmers into unsustainable agricultural intensification. We use farm-household survey data in order to compare the productivity of smallholder maize production under integrated (ISFM) and chemicalbased soil fertility management using a normalized translog yield response model. The results indicate higher maize yield responses for integrated soil fertility management options after controlling for the intensity of fertilizer application, labour intensity, seed rate as well as land husbandry practices a s well as selected policy factors. The... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Smallholder agriculture; Yield response model; Soil fertility management; Malawi; Land Economics/Use. |
| Ano: 2006 |
URL: http://purl.umn.edu/25407 |
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| Tchale, Hardwick; Sauer, Johannes. |
| In this paper we analyze the factors that influence the productivity of maize among smallholder farmers. We use farm-household survey data in order to compare the productivity of smallholder maize production under integrated (ISFM) and chemical-based soil fertility management using a normalized translog yield response model. The results indicate higher maize yield responses for integrated soil fertility management options after controlling for the intensity of fertilizer application, labour intensity, seed rate, land husbandry practices as well as selected policy factors. The estimated model is highly consistent with theoretical conditions. Thus we conclude that the use of ISFM improves maize productivity, compared to the use of inorganic fertilizer only.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Malawi; Smallholder agriculture; Soil fertility management; Yield response model; Farm Management. |
| Ano: 2006 |
URL: http://purl.umn.edu/14954 |
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| Birungi, Patrick; Hassan, Rashid M.. |
| This study investigates the impact of poverty, social capital and land tenure on the adoption of soil fertility management (SFM) and conservation technologies in Uganda. Considering four land management technologies (fallowing, terracing and inorganic and organic fertilizers), the study estimates a multinomial logit model to link farmers’ characteristics to the choice of technologies. The findings show that investments in land management are driven by factors such as land tenure security, level of poverty and participation in community organizations (social capital), and, most importantly, that household level poverty reduces the probability of adoption of most of the technologies, while social capital and land tenure security increase it. The findings... |
| Tipo: Journal Article |
Palavras-chave: Poverty; Social capital; Property rights; Soil fertility management; Uganda; Food Security and Poverty; Land Economics/Use. |
| Ano: 2010 |
URL: http://purl.umn.edu/93881 |
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| Pinto,Flávio Araújo; Souza,Edicarlos Damacena de; Paulino,Helder Barbosa; Curi,Nilton; Carneiro,Marco Aurélio Carbone. |
| Phosphorus (P) sorption by soils is a phenomenon that varies depending on soil characteristics, influencing its intensity and magnitude, which makes it a source or drain of P. The objective of this study was to determine the Maximum Phosphorus Adsorption Capacity (MPAC) and desorption of P from soils under native Savanna Brazilian and verify the correlation between MPAC and P Capacity Factor (PCF) with the chemical and physical properties of these soils. The study was conducted in seven soils under native Savannas. The Langmuir isotherms were adjusted from the values obtained in sorption assays, being evaluated the MPAC, the energy adsorption (EA) and PCF, which was calculated according to the levels of P-adsorbed and P-sorbed. Values of MPAC were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphorus adsorption capacity; Langmuir; Soil fertility management; Correction of P deficiency. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000600005 |
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